Apparatus for flattening and taking away blown tubing of plastics material

ABSTRACT

The process serves to distribute any variations in thickness in the peripheral direction of the tubing, in conjunction with a process in which the tubing is blown and is either wound up or processed further in stationary devices. The plane in which the tubing is flattened is pivotally moved about the axis of the tubing reversingly in steps of at least approximately 360*. The flattened tubing is deflected about a deflecting member, which is reversingly moved in unison with the flattening plane and is laterally offset from the axis of rotation of the flattening plane and disposed in a plane that is at right angles to the flattening plane. The tubing is then moved about additional deflecting members, which are disposed in planes that are parallel to the plane which contains the first deflecting member and are also pivotally moved reversingly about the axis of rotation of the flattening plane. The angles through which the deflecting members are moved decrease as the distance from the flattening station increases. Successive deflecting members are alternatingly disclosed at least close to and more remote from the axis of rotation of the flattening plane. The tubing which has moved about the last deflecting member is moved in a constant direction in another plane, which is at right angles to the axis of rotation of the flattening plane.

United States Patent 1 Kratzert 1 Feb. 13, 1973 APPARATUS FOR FLATTENINGAND TAKING AWAY BLOWN TUBING OF PLASTICS MATERIAL [75] Inventor:Friedrich Kratzert, Rosenheim- Schlossberg, Germany [73] Assignee:Windmoller & I-Iolscher, Lengerich of Westphalia, Germany [22] Filed:Sept. 22, 1970 [21] Appl. No.: 74,285

[30] Foreign Application Priority Data Sept. 27, 1969 Germany ..P 19 48935.1

[52] US. Cl ..425/392, 425/327 [51] Int. Cl. ..B29c 17/00 [58] Field ofSearch ...18/l45; 264/95; 425/324, 325, 425/392, 327

[56] References Cited UNITED STATES PATENTS Attorney-Fleit, Gipple &Jacobson 2/1970 Clarke et al. ..'.425/327,

[ ABSIRACT The process serves to distribute any variations in thicknessin the peripheral direction of the tubing, in conjunction with a processin which the tubing is blown and is either wound up or processed furtherin stationary devices. The plane in which the tubing is flattened ispivotally moved about the axis of the tubing reversingly in steps of atleast approximately 360. The flattened tubing is deflected about adeflecting member, which is reversingly moved in unison with theflattening plane and is laterally offset from the axis of rotation ofthe flattening plane and disposed in a plane that is at right angles tothe flattening plane. The tubing is then moved about additionaldeflecting members, which are disposed in planes that are parallel tothe plane which contains the first deflecting member and are alsopivotally moved reversingly about the axis of rotation of the flatteningplane. The angles through which the deflecting members are moveddecrease as the distance from the flattening station increases.Successive deflecting members are alternatingly disclosed at least closeto and more remote from the axis of rotation of the flattening plane.The tubing which has moved about the last deflecting member is moved ina constant direction in another plane, which is atright angles to theaxis of rotation of the flattening plane.

8 Claims, 10 Drawing Figures APPARATUS FOR FLATTENING AND TAKING AWAYBLOWN TUBING F PLASTICS MATERIAL it is known that thickness variationsare inevitable in the manufacture of sheeting of syntheticthermoplastics. When such sheeting varying in thickness is wound up, theextra thicknesses of the sheeting accumulate so that the roll is formedwith annular beads, which result in a permanent deformation of thesheeting in that area. When such sheeting is unwound, it is no longerperfectly planar so that the printing on the sheeting and its processingto packages or the like are rendered difficult.

in the blow-forming of tubing and the manufacture of flat sheeting by alongitudinal cutting of a blown tubing, the annular beads on the rollsand the resulting disadvantages may be avoided by a relative rotarymotion between the tubing blow head and the flattening and take-awaydevice. This rotation may consist of a continuous rotation or a rotationwhich is reversed after steps of about 360. As a result of thisrotation, the thickness variations of the sheeting are distributedthroughout the width of the roll, just as a rope which is wound on adrum, so that cylindrical rolls result which have no annular beads.

in order to avoid the disadvantages which are due to the known rotaryarrangement of the entire screw extruder or its tubing flow head or ofthe take-away and flattening device together with the means for windingup the sheeting, the French Pat. specification No. 1,553,853 discloses aprocess in which the blown tubing is made and is wound up or processedfurther in stationary apparatus and only the flattening plates and thesqueeze rollers are reversingly revolved in steps of 360. In thisprocess, the flattened tubing is moved about a deflecting member whichis inclined to the lon gitudinal direction of the sheeting and which isreversingly moved in unison with the flattening device. The tubing isthen moved in an on-edge orientation to guiding and deflecting rollersprovided at the periphery of the device for revolving the flattening andtake-away device. The tubing is thereafter moved to a stationarydeflecting member, which is also inclined to the longitudinal directionof the tubing, and from there is moved vertically downwardly to themeans for winding up the tubing. During the reversing angular movement,the tubing in an on-edge orientation is so deflected by the circularseries of deflecting rollers provided at the periphery of the revolvingmeans that the tubing, which is taken away continuously, does notcontact the deflecting members carried by the revolving wheel.

That known proposal has considerable important disadvantages. It resultsin a considerable increase in overall height because the tubing moved inan on-edge orientation requires an additional height above the squeezerollers, which height corresponds to the width of the tubing, inaddition to the space requirement for the revolving means and the like.Because sheeting in a width of as much as 3 meters is now required, theadditional height required in the known process is very considerable.Besides, the use of the known process particularly with wide and heavytubing often involves a slipping of the tubing as it moves in an on-edgeorientation or a sagging of the tubing, particularly because the tubingmust be moved in an on-edge orientation with a span of about three timesthe width of the tubing. This requirement cannot be fulfilled if thetubing if very wide. Another disadvantage of the known process residesin that the access to the flattening, squeezing and deflecting device isdifficult because that device is virtually enveloped as a result of itsreversing motion. The deflection by the deflecting rollers provided atthe periphery of the revolving means results in continual, considerablechanges in the length of the tubing between the blow head and the meansfor winding the tubing or the succeeding processing machine.Particularly where the arrangement is directly succeeded by a processingmachine, e.g., a printing machine, these changes are a greatdisadvantage because complicated measures are required to compensate thechanging speed of the tubing.

Another disadvantage of the known proposal resides in that one of thedeflecting members which are inclined to the longitudinal direction ofthe tubing belongs to the reversing system whereas the other of saiddeflecting members belongs to the stationary system so that variationsmay result from a swaying of parts of the superstructure and frominaccurate motion so that different relative positions are assumed bythe deflecting rods. Such different relative positions may result inconsiderable disturbances in operation. Another advantage of the knownarrangement resides in that the assembly requiring a high precision canbe carried out only on the site because the stationary and reversingdeflecting systems must be separately delivered.

It is an object of the invention to provide a process and apparatuswhich are free of the numerous disadvantages of the known system andenable more particularly the design of the required apparatus having asmall overall height and a movement of the flattened tubing from thereversing by moved squeeze rollers to a stationary feeding device,ensure an easy accessibility, a highly accurate motion and a simpleassembly, and avoid or minimize changes in the length of the tubingbetween the blow head and the winding-up or processing apparatus.

The process according to the invention which is proposed to solve thatobject is characterized in that the flattened tubing is deflected abouta deflecting member, which is reversingly moved in unison with theflattening plane and is laterally offset from the axis of rotation ofthe flattening plane and disposed in a plane that is at right angles tothe flattening plane, the tubing is then moved about additionaldeflecting members, which are disposed in planes that are parallel tothe plane which contains the first deflecting member and are alsopivotally moved reversingly about the axis of rotation of the flatteningplane, the angles through which the deflecting members are moveddecrease as the distance from the flattening station increases,successive deflecting members are alternatingly disposed at least closeto and more remote from the axis of rotation of the flattening plane,and the tubing which has moved about the last deflecting member is movedin a constant direction in another plane, which is at right angles tothe axis of rotation of the flattening plane. As a result of the processof the invention, the tubing which is moving inwardly and outwardlybetween the outer and inner deflecting members is moved with aninclination at least to the inner deflecting members so that it movesaway from said inner deflecting members with a corresponding inclinationwhen it has been deflected. As a result, all angular positions of thereversingly moved flattening plane can be compensated as the tubing isdeflected several times before it reaches the stationary feeding device.

When the process according to the invention is to be carried out by aflattening and take-away apparatus for handling blown tubing of plasticsmaterial made by a stationary tubing blow head, in which apparatus theflattening plates and squeeze rollers are adapted to be pivotally movedreversingly in steps of at least approximately 360 about the axis of thefed tubing, the apparatus is designed so that the squeeze rollers aresucceeded by a lateral deflecting rod, which is parallel to the squeezerollers and is reversingly moved in unison with them about the axis ofrotation of the flattening plates, said deflecting rod is succeeded byat least three additional deflecting rods, each of which is mounted tobe individually rotatable about the axis of rotation of the flatteningplates, the first and third of said additional deflecting rods aredisposed in the central region, the second of said additional deflectingrods is laterally disposed, the distance from the lateral deflectingrods to the axis of rotation is selected so that they are in anypossible operating position radially outwardly of the wrapped portionsof the deflecting rod which is disposed in the central region, and thelast deflecting rod is succeeded in the direction of travel of thetubing by stationary means for guiding the tubing.

The invention enables a very small overall height and a compact designof the reversing system. When the minimum number of four deflecting rodsare used, the additional height required over the squeeze rollerscorresponds only to four times the rod diameter. Because the tubing ismoved with a horizontal orientation in the reversing station associatedwith a conventional tubing blow head blowing in a vertical direction,there will be no slip and no sagging so that the apparatus according tothe invention can easily handle even very wide tubing. The apparatusaccording to the invention is easily accessible and the length of thetubing between the squeeze rollers and the feeding device remainssubstantially constant at all times so that undesired influences due tovarying speeds of the tubing, particularly if the apparatus is directlysucceeded by a processing machine, need not be feared. It will also bedesirable that all deflecting rods belong to one and the same system sothat relative changes between the position of the movable system and thesucceeding parts of the overall plant cannot adversely affect the exactmode of operation of the apparatus. The assembly is simplified becausethe entire device which serves to compensate the reversing motion of theflattening plates and squeeze rollers can be assembled by themanufacturer and it is sufficient on the site to install said deviceinto the overall plant between the tubing blow head and the means forwinding up the tubing or the succeeding processing machine.

According to the invention, at least those deflecting rods which aredisposed in the central region, near the axis of rotation of theflattening plane, have a surface structure which facilitates a movementof the deflected tubing with components of motion in the peripheral andaxial directions (turning rods). A turning rod may consist most simplyof a non-rotatable rod having a low-friction surface of plasticsmaterial. It may alternatively be provided on its surface with airoutlet orifices, through which air can be blown between the tubing andthe surface of the turning rod. In another embodiment, a multiplicity ofmovable balls are received in the surface of the turning rods. Numerousother embodiments of turning rods may be conceived.

A preferred embodiment of an apparatus according to the invention ischaracterized by a pair of squeeze rollers, which are carried by arevolving rim, which is pivotally movable reversingly through steps of360, a deflecting roller, which is mounted in the revolving rim anddisposed laterally of and extends parallel to the squeeze rollers, andthree deflecting rods, which are mounted in revolving rims which arecoaxial with the first revolving rim and pivotally movable independentlyof the first revolving rims, the first and third of said deflecting rodsbeing centrally disposed and the second deflecting rod being laterallydisposed, and by means for guiding the tubing, which means succeed thethird deflecting rod. At least the central deflecting rods consistsuitably of turning rods.

Further details of the invention will become apparent from thesubsequent specification with reference to the drawing, in which anembodiment of the invention is shown diagrammatically and by way ofexample. In the drawing FIGS. 1 to 5 are diagrammatic perspective topplan views showing the means provided according to the invention forguiding the tubing in different phases of an angular step of thereversing device.

FIG. 6 is a top plan view showing a central deflecting rod with itsrevolving rim and the lower lateral deflecting rod in the position shownin FIG. 1.

FIG. 7 is a sectional view showing one of the revolving rims which carrythe deflecting rods.

FIG. 8 is a diagrammatic view showing a device for interlocking therevolving rims and FIGS. 9 and 10 show means for a controlled drive of arevolving rim as shown in FIG. 7 in dependence on the angular movementof the pair of squeeze rollers.

A blown tubing 1 is delivered in the usual manner to a pair ofmotor-driven squeeze rollers 2, which are firmly mounted on a revolvingrim 3, which is reversingly moved through steps of 360. A deflectingroller 4 is fixed to the revolving rim 3 and disposed laterally of thesqueeze rollers 2 and extends parallel to the latter. The deflectingroller is pivotally moved in unison with the pair of squeeze rollers 2about the axis of rotation 6. The lateral distance of the deflectingroller 4 from the nip between the two squeeze rollers 2 or their axis ofrotation 6 must exceed one-half of the width of the tubing 1 because itwill be impossible otherwise to move the tubing about the succeedingturning rod 7.

That turning rod 7 is pivotally mounted above the squeeze rollers 2 andhas an axis of rotation 10 which is disposed approximately verticallyabove the axis of rotation 6 of the squeeze rollers 2. The turning rod 7serves to deflect the tubing through such angles that the changes causedin the direction of the tubing fed via the deflecting roller 4 by thepivotal movement of the pair of squeeze rollers 2 are compensated duringan angular movement through 180. For this purpose, the turning rod 7must be capable of changing the position of its longitudinal axisrelative to the longitudinal axis of the deflecting roll 4 through anangle of 45 from the parallel position toward both sides.

This object may be accomplished by various arrangements. The simplestarrangement is a mounting in a revolving rim such as is shown by way ofexample in a sectional view in FIG. 7. A rotatable inner rim 13 madefrom a T-section carries the turning rod 7 and is mounted in astationary outer rim 15, which is provided with anti-friction rollers14, and secured to stationary vertical columns 16. The pivotal movementof the turning rod 7 relative to the roller 4 may easily be limited to45 on both sides by the provision of corresponding stops.

Having left the turning rod 7, the tubing moves about the deflecting rod11, which may consist of a rotatably mounted roller and in a similarrevolving rim disposed above the turning rod 7 is mounted so that thelongitudinal axis of the rod 11 is a chord of the circle defined by therotating rim 23. The requirements concerning the distance from thedeflecting roller 11 from the center of its revolving rim 23, which isalso disposed vertically above the axis of rotation 6 of the squeezerollers 2, are the same as for the deflecting rollers 4. Both rollersare suitably spaced equal distances apart from the axes of their pivotalmovement.

From the deflecting roller 11, the tubing is moved about the turning rod12, which is disposed above the deflecting roll 1 l and is also mountedin a revolving rim 33. The requirements stated in connection with theturning rod 7 are analogously applicable to the turning rod 12. Theturning rod 12 serves to compensate the changes in the direction of thetubing coming from the deflecting roller 11 relative to the succeedingwinding device or the succeeding stationary guiding rollers. For thispurpose, the position of the longitudinal axis of the turning rod 12relative to the axis of rotation of the deflecting roller 11 may bechanged from the parallel position to both sides up to an angle of45.

At the beginning of an angular step of the revolving rim 3 and of thepair of squeeze rollers 2, the various rollers are in the position shownin FIG. 1. From that position, the pair of squeeze rollers 2 begin torevolve in unison with the deflecting roller 4 in the direction of thearrow about the axis of rotation 6. Whereas the deflecting roller 11 andthe deflecting rod 12 remain initially in their original position, theturning rod 7 follows the angular movement at one-half of the angularvelocity thereof to compensate the change in the direction of the tubingarriving from the deflecting roller 4 relative to the deflecting roller11. When the pair of squeeze rollers 2 have moved through an angle of90, the turning rod 7 has moved through an angle of 45. After thatmovement, the rollers are in the position shown in FIG. 2.

If the revolving rim 13 which carries the turning rod 7 is freelyrotatable and the tubing is of sufficient strength, the pivotal movementof the turning rod 7 is enforced by the tubing itself. Only when theresistance opposing the rotation is so high that it would stretch thetubing must the revolving rim 13 be provided with drive means so thatthe turning rod 7 is positively moved to positions which correspond tothe position of the deflecting roller 4 at any time.

This object may be accomplished in a simple manner, e.g., by a gearedtransmission for transmitting the angular movement of the pair ofsqueeze rollers 2 to the revolving rim 13 with a reduction ratio of 1:2.For this purpose, a rack 17 is secured to the revolving rim 3 andextends around one-half of its circumference. A rack 18 having the samediameter and the same number of teeth is provided on the revolving rim13 but extends only around one-fourth of the circumference of the rim13. Gears 19 and 20 having the same size mesh with the racks 17 and 18,respectively and are connected by a vertical shaft 21 and a reducinggear 22 having a reduction ratio of 1:2, as is shown in FIGS. 9 and 10.In this arrangement any angular movement of the revolving rim 3 with thesqueeze rollers 2 results in an angular movement of the revolving rim 13and the turning rod through one-half the angular'movement of therevolving rim 3 but only in a range which corresponds to an angularmovement of the turning rod 7 through 2 X 45 relative to the deflectingroller 2 because the rack 18 extends only around one-fourth of theperiphery of the revolving rim 13.

After a further angular movement of the squeeze roller 2 and thedeflecting roller 4 through these rollers are in the position shown inFIG. 3. The resulting change in the direction of the tubing which movesabout the roller 4 is compensated by a corresponding inward pivotalmovement of the turning rod 7, the longitudinal axis of which finallyincludes again an angle of 45 with the longitudinal axis of thedeflecting roller 4 (FIG. 3).

Whereas the deflecting roller 11 and the turning rod 12 have thus farremained in their initial position, they are now used to compensate thechange in the direction of the tubing during the remaining angularmovement of the squeeze rollers 2 through For this purpose, the rollers4 and 11 and the turning rod 7 are so interlocked when the positionshown in FIG. 3 has been reached that they can no longer change theirrelative position and can only move as a unit. Such interlock can beaccomplished in a simple manner with known means. An embodiment of suchdevice is diagrammatically shown in FIG. 8. A rod 25 is movably mountedon a frame part of the revolving rim 3 and can be moved upwardly ordownwardly by means of a lever 26, a magnet 27, and a spring 28 andunder control of an electric contact. When the position shown in FIG. 3is reached, the rod 25 moves upwardly into a gap between the guidemembers 29, which are secured to the revolving rim 13 for the turningrod 7. By that movement, the rod 25 pushes upwardly the rod 30, which isnormally held in a lower position by the spring 31 and which snapsbetween earns 32 provided on the revolving rim 23 for the deflectingroller 11.

When the deflecting rollers 4 and 11 and the turning rod 7 and the meanswhich carry these deflecting members have thus been interlocked, thelatter members revolve in unison to the position shown in FIG. 4 andafter a complete revolution of the revolving rim 3 and the pair oftake-away rolls 2 reach the position shown in FIG. 5, in which theangular movement is reversed and all motions are performed in thereverse order and direction.

From the position shown in FIG. 3 to the position shown in FIG. 5, theturning rod 12 has performed the same functions as previously theturning rod 7. For this purpose, the turning rod 12 is similarly mountedin a revolving rim 33 and may be provided with suitable drive means, ifdesired. Such drive means must be offset from that for the turning rod 7through 180. This has the advantage that the rack 17 which is providedon the revolving rim 3 and required to drive the turning rod 7 beginsthe revolution of the revolving rim 13 which carries the turning rod 12exactly when the drive for the revolving rim 33 carrying the turning rod7 has been terminated.

The sequence of movements of the deflecting members may be differentfrom the one described hereinbefore, although the latter appears to behighly desirable. Any other combinations of partial movements whichserve to accomplish the object of the process may be selected and areincluded in the invention.

Iclaim:

l. A flattening and take-away apparatus for handling a blown tubing ofplastics material made by a stationary blow head comprising flatteningelements and squeeze rollers adapted to be pivotally moved reversinglyin steps of at least approximately 360 about the axis of the fed tubing,a lateral deflecting rod positioned after the squeeze rollers andparallel to said squeeze rollers and adapted to be reversingly moved inunison with said rollers about the axis of rotation of said flatteningelements, at least three additional deflecting rods positioned aftersaid lateral deflecting rod, each of said additional deflecting rodsbeing mounted to be individually rotatable about the axis of rotation ofsaid flattening elements, the first and third of said additionaldeflecting rods being positioned in the region of said axis of rotation,the second of said additional deflecting rod being laterally positioned,the lateral deflecting rods being arranged at such a distance from saidaxis of rotation that they are, in all possible operating positions,positioned radially outwardly of the wrapped portions of said deflectingrod which is positioned in the region of said axis of rotation, andstationary means for guiding the tubing positioned after the last ofsaid deflecting rods in the direction of travel of said tubing.

2. Apparatus according to claim 1, in which said squeeze rollers arearranged in pair and are carried by a revolving rim which is adapted tobe pivotally moved reversingly through steps of 360, and in which saidlateral deflecting rod following said squeeze rollers is also mounted inthe revolving rim, and in which said additional deflecting rods aremounted in revolving rims which are coaxial with said first revolvingrim and pivotally movable independently of the said first revolving rim,said first and third of said additional deflecting rods being centrallypositioned and said second addition deflecting rod being laterallypositioned and in which said stationary means for guiding said tubing ispositioned after said third deflecting rod.

3. Apparatus according to claim 2, in which at least said centraldeflecting rods consist of turning rods.

4. Apparatus according to claim 2, in which said deflecting rods aremounted in superimposed revolving rim assemblies comprising a movableinner rim and a stationary outer rim and anti-friction rollers securedin stationary columns.

5. Apparatus according to claim 2, including means for interlocking saidrevolving rims for the first and second deflecting rods with saidrevolving rim for said squeeze rollers.

6. Apparatus accordlng to claim 5, m which said revolving rim for saidsqueeze rollers carries a rod which is vertically movable by a magnetagainst a spring force, and including guide members and a rod providedwith a return spring carried by the inner rim of said revolving rimassembly for said first deflecting rod, and further including couplingcams carried by said inner rim of said revolving rim assembly for saidsecond deflecting rod.

7. Apparatus according to claim 5, in which said first and thirddeflecting rods are adapted to move at onehalf of the speed of saidsqueeze rollers.

8.Apparatus according to claim 7, including a rack mounted on saidrevolving rim for said squeeze rollers and which has a lengthcorresponding to one-half of the periphery of a circle, and includingracks which are carried by the rotatable rims of said revolving rimassemblies for said first and third deflecting rods and which have alength corresponding to one-fourth of the periphery of a circle, andincluding gears of equal size connected by a reducing gear and in meshwith said racks.

1. A flattening and take-away apparatus for handling a blown tubing ofplastics material made by a stationary blow head comprising flatteningelements and squeeze rollers adapted to be pivotally moved reversinglyin steps of at least approximately 360* about the axis of the fedtubing, a lateral deflecting rod positioned after the squeeze rollersand parallel to said squeeze rollers and adapted to be reversingly movedin unison with said rollers about the axis of rotation of saidflattening elements, at least three additional deflecting rodspositioned after said lateral deflecting rod, each of said additionaldeflecting rods being mounted to be individuallY rotatable about theaxis of rotation of said flattening elements, the first and third ofsaid additional deflecting rods being positioned in the region of saidaxis of rotation, the second of said additional deflecting rod beinglaterally positioned, the lateral deflecting rods being arranged at sucha distance from said axis of rotation that they are, in all possibleoperating positions, positioned radially outwardly of the wrappedportions of said deflecting rod which is positioned in the region ofsaid axis of rotation, and stationary means for guiding the tubingpositioned after the last of said deflecting rods in the direction oftravel of said tubing.
 1. A flattening and take-away apparatus forhandling a blown tubing of plastics material made by a stationary blowhead comprising flattening elements and squeeze rollers adapted to bepivotally moved reversingly in steps of at least approximately 360*about the axis of the fed tubing, a lateral deflecting rod positionedafter the squeeze rollers and parallel to said squeeze rollers andadapted to be reversingly moved in unison with said rollers about theaxis of rotation of said flattening elements, at least three additionaldeflecting rods positioned after said lateral deflecting rod, each ofsaid additional deflecting rods being mounted to be individuallYrotatable about the axis of rotation of said flattening elements, thefirst and third of said additional deflecting rods being positioned inthe region of said axis of rotation, the second of said additionaldeflecting rod being laterally positioned, the lateral deflecting rodsbeing arranged at such a distance from said axis of rotation that theyare, in all possible operating positions, positioned radially outwardlyof the wrapped portions of said deflecting rod which is positioned inthe region of said axis of rotation, and stationary means for guidingthe tubing positioned after the last of said deflecting rods in thedirection of travel of said tubing.
 2. Apparatus according to claim 1,in which said squeeze rollers are arranged in pair and are carried by arevolving rim which is adapted to be pivotally moved reversingly throughsteps of 360*, and in which said lateral deflecting rod following saidsqueeze rollers is also mounted in the revolving rim, and in which saidadditional deflecting rods are mounted in revolving rims which arecoaxial with said first revolving rim and pivotally movableindependently of the said first revolving rim, said first and third ofsaid additional deflecting rods being centrally positioned and saidsecond addition deflecting rod being laterally positioned and in whichsaid stationary means for guiding said tubing is positioned after saidthird deflecting rod.
 3. Apparatus according to claim 2, in which atleast said central deflecting rods consist of turning rods.
 4. Apparatusaccording to claim 2, in which said deflecting rods are mounted insuperimposed revolving rim assemblies comprising a movable inner rim anda stationary outer rim and anti-friction rollers secured in stationarycolumns.
 5. Apparatus according to claim 2, including means forinterlocking said revolving rims for the first and second deflectingrods with said revolving rim for said squeeze rollers.
 6. Apparatusaccording to claim 5, in which said revolving rim for said squeezerollers carries a rod which is vertically movable by a magnet against aspring force, and including guide members and a rod provided with areturn spring carried by the inner rim of said revolving rim assemblyfor said first deflecting rod, and further including coupling camscarried by said inner rim of said revolving rim assembly for said seconddeflecting rod.
 7. Apparatus according to claim 5, in which said firstand third deflecting rods are adapted to move at one-half of the speedof said squeeze rollers.